AZ31镁合金板材等径角轧制变形规律研究

对等径角轧制过程中AZ31镁合金板材的应力应变状态进行了分析,采用有限元对不同通道间隙下板材的应变状态进行了模拟,研究了不同通道间隙下镁合金板材晶粒取向的演变规律及其对晶粒取向的影响。结果表明,在等径角轧制过程中,板材在模具转角处受到剪应力和压应力的作用;随通道间隙的增加,板材的变形由剪切变形演变为剪切+弯曲变形,甚至弯曲变形;由于剪应力的作用,AZ31镁合金板材的晶粒取向由普通轧制所形成的基面取向转变为等径角轧制后的非基面取向,随着剪切变形量的减小,基面沿轧制方向的偏转角度也逐渐减小。

Deformation law of equal channel angular rolling for AZ31 magnesium alloy sheets

The state of stress and strain for AZ31 magnesium alloy sheets during equal channel angular rolling processing was analyzed and simulated by finite element method under different channel clearances.The evolvement of grain orientation for the sheets during this processing and the influence of channel clearance on it were investigated.The results indicate that the shear stress and compression stress are put on the sheet at the channel corner during equal channel angular rolling.And the shearing deformation on the sheet is transformed to shearing deformation plus bending deformation,even bending deformation with increasing of the channel clearance.The grain orientation of AZ31 magnesium alloy sheets produced by equal channel angular rolling process is evolved from(0002) basal plane orientation for the normally rolling sheet to non-basal plane orientation and the tilt angle between basal plane and rolling direction decreased with increasing of the channel clearance.